Lua APA (7ú heag.)

CEI. (1991). GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I.

Lua i Stíl Chicago (17ú heag.)

CEI. GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I, 1991.

Lua MLA (9ú heag.)

CEI. GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I, 1991.

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